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tcpip.h
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/*************************** TCPIP.H ********************************/
#ifndef _TCPIP_H_
#define _TCPIP_H_
#define IP_HDRINCL 2
// Standard TCP flags
#define URG 0x20
#define ACK 0x10
#define PSH 0x08
#define RST 0x04
#define SYN 0x02
#define FIN 0x01
// Our tcp header struct
typedef struct tcphdr {
unsigned short sport; // Source port
unsigned short dport; // Destination port
unsigned int seq; // Sequence number
unsigned int ack_seq; // Acknowledgement number
unsigned char lenres; // Length return size
unsigned char flags; // Flags and header length
unsigned short window; // Window size
unsigned short checksum; // Packet Checksum
unsigned short urg_ptr; // Urgent Pointer
} TCPHEADER;
// Our tcp header struct
typedef struct tcphdr2 {
unsigned short source; // Source port
unsigned short dest; // Destination port
unsigned int seq; // Sequence number
unsigned int ack_seq; // Acknowledgement number
unsigned short res1;
unsigned short doff;
unsigned short fin;
unsigned short syn;
unsigned short rst;
unsigned short psh;
unsigned short ack;
unsigned short urg;
unsigned short res2;
unsigned short window; // Window size
unsigned short check; // Packet Checksum
unsigned short urg_ptr; // Urgent Pointer
} TCPHEADER2;
// Our ip header struct
typedef struct iphdr {
unsigned char verlen; // IP version & length
//unsigned int h_len:4; // Length of the header
//unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // Total length of the packet
unsigned short ident; // Unique identifier
unsigned short frag_and_flags; // Flags
unsigned char ttl; // Time to live
unsigned char proto; // Protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP; // Source IP
unsigned int destIP; // Destination IP
} IPHEADER;
// Our pseudo header struct
typedef struct pshdr {
unsigned int saddr; // Source address
unsigned int daddr; // Destination address
unsigned char zero; // Placeholder
unsigned char proto; // Protocol
unsigned short length; // TCP length
struct tcphdr tcp; // TCP Header struct
} PSDHEADER;
// Our udp header struct
typedef struct udphdr {
unsigned short source; // Source port
unsigned short dest; // Destination port
unsigned short length; // Packet length
unsigned short checksum; // Packet checksum
} UDPHEADER;
// Our icmp header struct
typedef struct icmphdr {
unsigned char type; // Type of ICMP packet
unsigned char subcode; // Subcode of type of packet
unsigned short checksum; // Packet checksum
unsigned short id; // ID number
unsigned short seq; // Sequence number
} ICMPHEADER;
#endif
/********************** END TCPIP.H *************************************/